Hubfly - Intranet solutions integrated with Office 365
Product School - The global leader in product management training
Quiver - Quiver is a notebook built for programmers.
The Product Folks - A volunteer-led community of product managers and makers
Bear - Bear.app is a note-taking and content writing app that helps you boost productivity with its intuitive tools.
Intercom on Product Management - The ultimate resource for aspiring product managers